To send a support message to Robinhood, you can use the in-app chat or call 1 (866)-935-1354. Open the Robinhood app, tap your profile icon, go to Help, and select Contact Us. Choose the issue you need help with, and if messaging is available, select Message Us. For alternative support, try 1.866.935.1354 or 1-866-935(1354). Messaging ensures secure communication and allows you to receive written support from a Robinhood representative.